APA (7th ed.) Citation

Whipple, F. L., & Green, D. W. E. (1985). The mystery of comets. Smithsonian Institution Press.

Chicago Style (17th ed.) Citation

Whipple, Fred L., and Daniel W. E. Green. The Mystery of Comets. Washington, D.C.: Smithsonian Institution Press, 1985.

MLA (9th ed.) Citation

Whipple, Fred L., and Daniel W. E. Green. The Mystery of Comets. Smithsonian Institution Press, 1985.